#include <iostream>

using namespace std;

typedef long long LL;

LL a, b, p;

LL qmul(LL a, LL b, LL p)
{
	LL ret = 0;
	while (b)
	{
		if (b & 1) ret = (ret + a) % p;
		a = (a + a) % p;
		b >>= 1;
	}
	return ret;
}

int main()
{
	cin >> a >> b >> p;
	
	cout << qmul(a, b, p) << endl;;
	
	return 0;
}